Improvement in turbine fan-blowers



Unirse S'rafrns PATENT @errent MARVIN SMITH, OF NEV HAVEN, CONNECTICUT.

IMPROVEMENT IN TURBINE FAN-BLOWERS.

Specification forming part of Letters Patent No. 48,986, dated July 25, 1385.

To all whom it 'may concern:

Be it known that 1MARV1N SMITH, of the city and county ot' New Haven, in the State of Connecticut, have invented a new and useful Improvement in Turbine Fan-Blowers; and I do hereby declare that the following is a full, clear, and exact description ot' the construction, character, and operation of the same, reference being had to the accompanying drawings, which make part ot' this speci tication, in which- Figure l is a perspective View of the blower' as ready lor use, showing one end of the revolving fan, air-space, die. Fig. 2 is a plan ot the saine, cut vertically through the center at right angles to the shaft, showing the vanes or blades of the fan, the volute-shaped fan-box, and annular disk or casing.

My improvement consists in making the revolving fan with a. suitable number of vanes or blades and two broad annular disks or rings extending from the extreme outer ends ot' the vanes to about two-thirds ot' the distance to the hub orshat't, (forming side casings,) so that all of the air which passes in at the open center will (bythe centrifugal torce) be thrown out at the outer extremities of the vanes into the volute l'an box or chamber, thus keeping up a partial vacuum to cause the air from without to be forced in through the central opening, while it will all be forced out at the ends of the Yanes into the volute-shaped chamber or fan-box and out at the oritice.

I make the frame A A A of cast-iron or any other suitable material, substantially in the form represented in Fig. l, with a circular hole or space in the central part, (through both disks,) as indicated at a, a, Fig. l, and also in section in Fig. 2, ot' the proper size to receive the rotary fan or blower B B; and between the two disks of the frame I t'a lange or band, C, Fig. 1, in a scroll or volute position, as shown at C C, Fig. 2, which forms the fan box or chamber through which the blast is forced (by the revolution ofthe fan) out at the oritice or embrasure I), Figs. l and 2.

I make the fan ot' iron or any other suitable material, with a suitable number of vanes or blades attached to the shaft c, as shown at b i), &c., in Fig. 2 and in part in Fig. l, and of a width along the shaft equal to the depth of the fan box or chamber C in that direction. On the two edges ot' these vanes I lit annular disks or casings, which should extend about two-thirds ot' the distance from the outer extremity of the vanes to the shaft, as shown at B, Figs. l and 2, so as to inclose the outer portion ot' the two sides, so that when the fan is revolved in the direction indicated by the darts the air will be carried round in apartments closed on four sides, whence it can only escape by the centrifuga-l force (as indicated by the darts) into the volute-shaped chamber or fan-box. (Shown at a aY D, Fig. 2.) On the shat't or arbor c I lita suitable driving-pulley, d, on which a belt is worked to drive the fan. I tit two suitable posts or standards, one ot' which is shown at E, Fig. l, and the other is opposite, but not seen, which support the bearings for the journals of the shat't, as at g, Fig. l.

Having made the several parts as before described, and titted the fan in its position, as represented in Fig. l, I put it in motion by a belt on the driving-pulley d, and revolve it in the direction indicated by the dart-s, when, by the centrifugal force, the air in the spaces between the vanes b b, 85o., will be thrown out, as indicated by the darts, into the volute fanbox, as a c., and the blast forced out at D;

and as the centrifugal force displaces the air within a partial vacuum will be formed, into which the outer air will be forced, so as to produce a constant blast at D.

rIhe advantages ot' my improvement consist in that by haring the annular disks or casings attached to the varies, so as to revolve with them, the air is much more compressed in the apartments of the fan, and in its motion it is free from friction, except that which is caused by its impinging on the concave surface of the volute-shaped fan box or chamber, where the deiiection is easy and regular, and amounts to but a mere fraction ot that which is caused by the air coming also in contact with. the plain sides of the stationary parts or sides ot' the fan-box,4 when they cover a large portion ofthe length ofthe vanes, as has heretofore been the case, so that to equal the force ot' the blast the velocity ofthe ian is required to be only a. small part of that commonly used. Thus it saves a great amount of weer and expense of repairs, as Well as great liability to accident from such high velocity, While it will accomplish the desired result in a much more simple and yet ecient manner.

What I'claim as my invention, and desire to secure by Letters Patent, is-

The combination ot the annular disks or cesings B B with the valles or blades I) b, Snc., when the whole is constructed, arranged, and fitted to operate with the parts C and D, substantially as herein described MARVIN SMITH.

Witnesses:

L. D. DAVIS, R. FITZGERALD. 

